<template>
  <div class="player" v-show="playlist.length>0">
    <transition name="normal"
                @enter="enter"
                @after-enter="afterEnter"
                @leave="leave"
                @after-leave="afterLeave"
    >
      <div class="normal-player" v-show="fullScreen">
        <div class="background">
          <img width="100%" height="100%" :src="currentSong.image">
        </div>
        <div class="top">
          <div class="back" @click="back">
            <i class="icon-back"></i>
          </div>
          <h1 class="title" v-html="currentSong.name"></h1>
          <h2 class="subtitle" v-html="currentSong.singer" ></h2>
        </div>
        <div class="middle" 
          @touchstart.prevent="middleTouchStart"
          @touchmove.prevent="middleTouchMove"
          @touchend="middleTouchEnd"
        >
          <div class="middle-l" ref="middleL" >
            <div class="cd-wrapper" ref="cdWrapper">
              <div class="cd" :class="cdCls" >
                <img class="image" :src="currentSong.image">
              </div>
            </div>
            <div class="playing-lyric-wrapper">
              <div class="playing-lyric">{{playingLyric}}</div>
            </div>
          </div>
          <scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
            <div class="lyric-wrapper">
              <div v-if="currentLyric">
                <p ref="lyricLine"
                   class="text"
                   :class="{'current': currentLineNum ===index}"
                   v-for="(line,index) in currentLyric.lines">{{line.txt}}</p>
              </div>
            </div>
          </scroll>
        </div>
        <div class="bottom">
          <div class="dot-wrapper">
             <span class="dot" :class="{'active':currentShow==='cd'}"></span>
             <span class="dot" :class="{'active':currentShow==='lyric'}"></span>
          </div>
          <div class="progress-wrapper">
            <span class="time time-l">{{format(currentTime)}}</span>
            <div class="progress-bar-wrapper">
              <progress-bar @percentChange="onProgressBarChange" :percent="percent"></progress-bar>
            </div>
            <span class="time time-r">{{format(currentSong.duration)}}</span>
          </div>  
          <div class="operators">
            <div class="icon i-left" @click="changeMode">
              <i :class="iconMode"></i>
            </div>
            <div class="icon i-left" :class="disableCls" >
              <i @click="prev" class="icon-prev" ></i>
            </div>
            <div class="icon i-center" :class="disableCls" >
              <i @click="togglePlaying" :class="playIcon" ></i>
            </div>
            <div class="icon i-right" :class="disableCls">
              <i @click="next" class="icon-next" ></i>
            </div>
            <div class="icon i-right">
              <i class="icon icon-not-favorite"></i>
            </div>
          </div>
        </div>
    
      <!--播放页面全屏-->
      </div>
    </transition>
    <!--播放页面小屏 底部-->
    <transition name="mini">
      <div class="mini-player" v-show="!fullScreen" @click="open">
        <div class="icon">
          <img :class="cdCls" width="40" height="40" :src="currentSong.image">
        </div>
        <div class="text">
          <h2 class="name" v-html="currentSong.name"></h2>
          <p class="desc" v-html="currentSong.singer"></p>
        </div>
        <div class="control">
          <progress-circle :radius="radius" :percent="percent">
          <i @click.stop="togglePlaying" class="icon-mini" :class="miniIcon"></i>
          </progress-circle>radius
        </div>
        <div class="control">
          <i class="icon-playlist"></i>
        </div>
      </div>
    </transition>
    <audio ref="audio" @ended="end"  @timeupdate="updateTime" :src="currentSong.url" @error="error" @canplay="ready"></audio>
  </div>
</template>
<script type="text/ecmascript-6">
   import {mapGetters,mapMutations} from 'vuex'
   import animations from 'create-keyframe-animation'
   import {prefixStyle} from 'common/js/dom'
   import ProgressBar from 'base/progress-bar/progress-bar'
   import ProgressCircle from 'base/progress-circle/progress-circle'
   import {playMode} from 'common/js/config'
   import {shuffle} from 'common/js/util'
   import Lyric from 'lyric-parser'
   import Scroll from 'base/scroll/scroll'
   const transform=prefixStyle('transform')
   const transitionDuration=prefixStyle('transitionDuration')

   export default {
     data(){
         return {
             songReady:false,
             currentTime:0,
             radius:32,
             currentLyric:null,
             currentLineNum:0,
             currentShow:'cd',
             playingLyric:''
         }
     },
     computed:{
         cdCls(){
            return this.playing ? 'play':'play pause'
         },
         playIcon(){
            return this.playing? 'icon-pause':'icon-play'
         },
         miniIcon(){
            return this.playing? 'icon-pause-mini':'icon-play-mini'
         },
         disableCls(){
             return this.songReady? '' :'disable'
         },
         percent(){
             return this.currentTime/this.currentSong.duration
         },
         iconMode(){
              return this.mode===playMode.sequence? 'icon-sequence':this.mode===playMode.loop?'icon-loop':'icon-random'
         },
        ...mapGetters([
            'fullScreen',
            'playlist',
            'currentSong',
            'playing',
            'currentIndex',
            'mode',
            'sequenceList'
        ])
     },
     created(){
      this.touch={}
     },
     methods:{
         back(){
             this.setFullScreen(false)
         },
         open(){
            this.setFullScreen(true)
         },
         enter(el,done){
            const {x,y,scale}=this._getPosAndScale()
            let animation = {
                0: {
                    transform:`translate3d(${x}px,${y}px,0) scale(${scale})`
                },
                60: {
                    transform:`translate3d(0,0,0) scale(1.1)`
                },
                100: {
                    transform:`translate3d(0,0,0) scale(1)`
                }
            }
            animations.registerAnimation({
                name:'move',
                animation,
                presets:{
                   duration:400,
                   easing:'linear' 
                }
            })
            animations.runAnimation(this.$refs.cdWrapper,'move',done)
         },
         afterEnter(){  
            animations.unregisterAnimation('move')
            this.$refs.cdWrapper.style.animation=''
         },
         leave(el,done){
            this.$refs.cdWrapper.style.transition='all 0.4s'
            const {x,y,scale}=this._getPosAndScale()
            this.$refs.cdWrapper.style[transform]=`translate3d(${x}px,${y}px,0) scale(${scale})`
            this.$refs.cdWrapper.addEventListener('transitionend',done)
         },
         afterLeave(){
            this.$refs.cdWrapper.style.transtion=''
            this.$refs.cdWrapper.style[transform]=''
         },
         togglePlaying(){
             if(!this.songReady){
                 return 
             }
             this.setPlayingState(!this.playing)
             if(this.currentLyric){
               this.currentLyric.togglePlay()
             }
         },
         end(){
           console.log("aaa")
           if(this.mode===playMode.loop){
             this.loop()
           }else{
            this.next()
           }
          
         },
         loop(){
           this.$refs.audio.currentTime=0
           this.$refs.audio.play()
           if(this.currentLyric){
             this.currentLyric.seek(0)
           }
         },
         next(){
             if(!this.songReady){
                 return 
             }
             if(this.playlist.length===1){
               this.loop()
             }else{
              let index=this.currentIndex+1
              if(index=== this.playlist.length){
                index=0
              }
              this.setCurrentIndex(index)
              if(!this.playing){
                this.togglePlaying()
              }
            }
            this.songReady=false
         },
         prev(){
             if(!this.songReady){
                 return 
             }
              if(this.playlist.length===1){
               this.loop()
              }else{
                let index=this.currentIndex-1
                if(index===-1){
                  index=this.playlst.length-1
              }
                this.setCurrentIndex(index)
                if(!this.playing){
                  this.togglePlaying()
                }
             }
            this.songReady=false
         },
         ready(){
             this.songReady=true
         },
         error(){
            this.songReady=true
         },
         updateTime(e){
            this.currentTime=e.target.currentTime
         },
         format(interval){
             interval=interval|0
             const minute=interval/60 | 0
             const second=this._pad(interval%60)
             return `${minute}:${second}`
         },
         onProgressBarChange(percent){
           const currentTime=this.currentSong.duration*percent
           this.$refs.audio.currentTime=currentTime
           if(!this.playing){
             this.togglePlaying()
           }
           if(this.currentLyric){
             this.currentLyric.seek(currentTime*1000)
           }
         },
         changeMode(){
            const mode=(this.mode+1)%3
            this.setPlayMode(mode)
            let list=null
            if(mode===playMode.random){
              list=shuffle(this.sequenceList)
            } else {
              list=this.sequenceList
            }
            this.resetCurrentIndex(list)
            this.setPlaylist(list)
         },
         resetCurrentIndex(list){
           let index=list.findIndex((item)=>{
              return item.id===this.currentSong.id
           })
           this.setCurrentIndex(index)
         },
          getLyric(){
            this.currentSong.getLyric().then((lyric)=>{
              this.currentLyric=new Lyric(lyric,this.handleLyric)
              if(this.playing){
                 this.currentLyric.play()
              }
            }).catch(()=>{
              this.currentLyric=null
              this.playingLyric=''
              this.currentLineNum=0
            })
          },
          handleLyric({lineNum,txt}){
            this.currentLineNum=lineNum
            if(lineNum>5){
              let lineEl=this.$refs.lyricLine[lineNum-5]
              this.$refs.lyricList.scrollToElement(lineEl,1000)
            }else {
              this.$refs.lyricList.scrollTo(0,0,1000)
            }
            this.playingLyric=txt
          },
          middleTouchStart(e){
            this.touch.initiated=true
            const touch=e.touches[0]
            this.touch.startX=touch.pageX
            this.touch.startY=touch.pageY
          },
          middleTouchMove(e){
            if(!this.touch.initiated){
              return
            }
            const touch=e.touches[0]
            const deltaX=touch.pageX-this.touch.startX
            const deltaY=touch.pageY-this.touch.startY
            if(Math.abs(deltaY)>Math.abs(deltaX)){
              return 
            }
            const left=this.currentShow==='cd'? 0 : -window.innerWidth
            const offsetWidth =Math.min(0,Math.max(-window.innerWidth,left+deltaX))
            this.touch.percent=Math.abs(offsetWidth/window.innerWidth)
            this.$refs.lyricList.$el.style[transform]=`translate3d(${offsetWidth}px,0,0)`
             this.$refs.lyricList.$el.style[transitionDuration]=0
             this.$refs.middleL.style.opacity=1-this.touch.percent
             this.$refs.middleL.style[transitionDuration]=0

          },
          middleTouchEnd(e){
            let offsetWidth
            let opacity
            if(this.currentShow==='cd'){
              if(this.touch.percent>0.1){
                offsetWidth=-window.innerWidth
                opacity=0
                this.currentShow='lyric'
              }else {
                offsetWidth=0
                opacity=1
              }
            }else {
              if(this.touch.percent<0.9){
                offsetWidth=0
                this.currentShow='cd'
                opacity=1
              }else{
                offsetWidth=-window.innerWidth
                opacity=0
              }
            }
            const time=300
             this.$refs.lyricList.$el.style[transform]=`translate3d(${offsetWidth}px,0,0)`
             this.$refs.lyricList.$el.style[transitionDuration]=`${time}ms`
             this.$refs.middleL.style.opacity=opacity
             this.$refs.middleL.style[transitionDuration]=`${time}ms`
          },
         _pad(num,n=2){
            let len=num.toString().length
            while(len<n){
                num='0'+num
                len++
            }
            return num
         },

         _getPosAndScale(){
            const targetWidth=40
            const paddingLeft=40
            const paddingBottom=30
            const paddingTop=80
            const width=window.innerWidth*0.8
            const scale=targetWidth/width
            const x=-(window.innerWidth/2- paddingLeft)
            const y=window.innerHeight-paddingTop-width/2-paddingBottom
            return {
                x,
                y,
                scale
            }

         },
         ...mapMutations({
             setFullScreen:'SET_FULL_SCREEN',
             setPlayingState:'SET_PLAYING_STATE',
             setCurrentIndex:'SET_CURRENT_INDEX',
             setPlayMode:'SET_PLAY_MODE',
             setPlaylist:'SET_PLAYLIST'
         }),
     },
     watch:{
         currentSong(newSong,oldSong){
           if(newSong.id===oldSong.id){
             return
           }
           if(this.currentLyric){
             this.currentLyric.stop()
           }
             setTimeout(()=>{
                this.$refs.audio.play()
                this.getLyric()
             },1000)
        },
        playing(newPlaying){
            const audio=this.$refs.audio
            this.$nextTick(()=>{
                newPlaying? audio.play() :audio.pause()
            })
        }
      },
      components:{
        ProgressBar,
        ProgressCircle,
        Scroll
      }
   }
  

</script>
<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "~common/stylus/variable"
  @import "~common/stylus/mixin"

  .player
    .normal-player
      position: fixed
      left: 0
      right: 0
      top: 0
      bottom: 0
      z-index: 150
      background: $color-background
      .background
        position: absolute
        left: 0
        top: 0
        width: 100%
        height: 100%
        z-index: -1
        opacity: 0.6
        filter: blur(20px)
      .top
        position: relative
        margin-bottom: 25px
        .back
          position absolute
          top: 0
          left: 6px
          z-index: 50
          .icon-back
            display: block
            padding: 9px
            font-size: $font-size-large-x
            color: $color-theme
            transform: rotate(-90deg)
        .title
          width: 70%
          margin: 0 auto
          line-height: 40px
          text-align: center
          no-wrap()
          font-size: $font-size-large
          color: $color-text
        .subtitle
          line-height: 20px
          text-align: center
          font-size: $font-size-medium
          color: $color-text
      .middle
        position: fixed
        width: 100%
        top: 80px
        bottom: 170px
        white-space: nowrap
        font-size: 0
        .middle-l
          display: inline-block
          vertical-align: top
          position: relative
          width: 100%
          height: 0
          padding-top: 80%
          .cd-wrapper
            position: absolute
            left: 10%
            top: 0
            width: 80%
            height: 100%
            .cd
              width: 100%
              height: 100%
              box-sizing: border-box
              border: 10px solid rgba(255, 255, 255, 0.1)
              border-radius: 50%
              &.play
                animation: rotate 20s linear infinite
              &.pause
                animation-play-state: paused
              .image
                position: absolute
                left: 0
                top: 0
                width: 100%
                height: 100%
                border-radius: 50%

          .playing-lyric-wrapper
            width: 80%
            margin: 30px auto 0 auto
            overflow: hidden
            text-align: center
            .playing-lyric
              height: 20px
              line-height: 20px
              font-size: $font-size-medium
              color: $color-text-l
        .middle-r
          display: inline-block
          vertical-align: top
          width: 100%
          height: 100%
          overflow: hidden
          .lyric-wrapper
            width: 80%
            margin: 0 auto
            overflow: hidden
            text-align: center
            .text
              line-height: 32px
              color: $color-text-l
              font-size: $font-size-medium
              &.current
                color: $color-text
      .bottom
        position: absolute
        bottom: 50px
        width: 100%
        .dot-wrapper
          text-align: center
          font-size: 0
          .dot
            display: inline-block
            vertical-align: middle
            margin: 0 4px
            width: 8px
            height: 8px
            border-radius: 50%
            background: $color-text-l
            &.active
              width: 20px
              border-radius: 5px
              background: $color-text-ll
        .progress-wrapper
          display: flex
          align-items: center
          width: 80%
          margin: 0px auto
          padding: 10px 0
          .time
            color: $color-text
            font-size: $font-size-small
            flex: 0 0 30px
            line-height: 30px
            width: 30px
            &.time-l
              text-align: left
            &.time-r
              text-align: right
          .progress-bar-wrapper
            flex: 1
        .operators
          display: flex
          align-items: center
          .icon
            flex: 1
            color: $color-theme
            &.disable
              color: $color-theme-d
            i
              font-size: 30px
          .i-left
            text-align: right
          .i-center
            padding: 0 20px
            text-align: center
            i
              font-size: 40px
          .i-right
            text-align: left
          .icon-favorite
            color: $color-sub-theme
      &.normal-enter-active, &.normal-leave-active
        transition: all 0.4s
        .top, .bottom
          transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
      &.normal-enter, &.normal-leave-to
        opacity: 0
        .top
          transform: translate3d(0, -100px, 0)
        .bottom
          transform: translate3d(0, 100px, 0)
    .mini-player
      display: flex
      align-items: center
      position: fixed
      left: 0
      bottom: 0
      z-index: 180
      width: 100%
      height: 60px
      background: $color-highlight-background
      &.mini-enter-active, &.mini-leave-active
        transition: all 0.4s
      &.mini-enter, &.mini-leave-to
        opacity: 0
      .icon
        flex: 0 0 40px
        width: 40px
        padding: 0 10px 0 20px
        img
          border-radius: 50%
          &.play
            animation: rotate 10s linear infinite
          &.pause
            animation-play-state: paused
      .text
        display: flex
        flex-direction: column
        justify-content: center
        flex: 1
        line-height: 20px
        overflow: hidden
        .name
          margin-bottom: 2px
          no-wrap()
          font-size: $font-size-medium
          color: $color-text
        .desc
          no-wrap()
          font-size: $font-size-small
          color: $color-text-d
      .control
        flex: 0 0 30px
        width: 30px
        padding: 0 10px
        .icon-play-mini, .icon-pause-mini, .icon-playlist
          font-size: 30px
          color: $color-theme-d
        .icon-mini
          font-size: 32px
          position: absolute
          left: 0
          top: 0

  @keyframes rotate
    0%
      transform: rotate(0)
    100%
      transform: rotate(360deg)
</style>
